A Microsoft Excel file containing the data that forms the figures in the main text of the publication. The Microsoft Excel file contains the transient absorption and photoluminescence data, the photoluminescence-detected magnetic resonance data, the GIWAXS data, and the data underlying the plots discussing the impact of triplet-triplet annihilation on the open circuit voltage of a solar cell.

The transient absorption data is from the infrared region (1200-1600 nm) and was measured with laser excitation at 800 nm. The time resolved photoluminescence data was measured over nanosecond timescales with laser excitation at 700 nm. The photoluminescence-detected magnetic resonance data was measured with 532 nm laser excitation at X-band microwave frequencies. The GIWAXS was performed in a Xeuss 2.0 SAXS/WAXS laboratory beamline using a Cu X-ray source (8.05 keV, 1.54 Å) and a Pilatus3R 300K detector. The incidence angle is 0.2. All measurements were conducted under a vacuum environment to reduce air scattering.